Why my nsys-ui cannot visualize stream?

Accelerated Computing CUDA CUDA Programming and Performance
1

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New learner for cuda. And I want to assure whether the stream are concurrency. But there is no visualize grpah in nsys-ui.

2

OK. I found the problem.
I just run kernel like this.

__global__ void kernel_1(double sum){
    for(int i = 0 ; i < N ; ++i ){
        sum += tan(0.1) * tan(0.1);
    }
}

And it will be ignore by nvcc for there is no output.
After change code :

__global__ void kernel_1(double * sum){
    for(int i = 0 ; i < N ; ++i ){
        *sum += tan(0.1) * tan(0.1);
    }
}

It works.